<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>添加样式</title>
    <style type="text/css">
        p {
            font-size: 12px;
            color: #930;
            text-align: center;
        }
    </style>
</head>
<body>
    <p>Hello World!</p>
</body>
</html>